Electric regulation.



WITNESSES .J. L. CREVELING.

ELECTRIC REGULATOR.

APPLICATION FILED MAR. 4. I912.

Patented J 11119 20, 1916.

INVENTOR UNITED STATES PATENTOFFICE.

JOHN L. CBEVELING, OF NEW YORK, N. Y., ASSIGNOR TO SAFETY CAR HEATING AND LIGHTING COMPANY, A CORPORATION OF NEW JERSEY.

ELECTRIC REGULATION.

To all whom it may concern:

Be it known that I, JOHN L. CREVELING, a resident of New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Electric Regulation, as set forth in the annexed specification and drawing, forming a part thereof.

My invention pertains to that class of electric regulation wherein it is desired to automatically regulate a dynamo in a predetermined manner and has for a ject to provide means where y a dynamo driven at variable speeds may be automatically governed to properly charge a storage battery and operate lamps or other translat- I ing devices.

he drawing is a diagrammatic representation of one type of system embodying the essentials of my invention.

7 In the drawing, 1 represents a dynamo or generator provided with the usual field coil 2, having in series therewith a regulating element 3, in this instance indicated as a resistance of the carbon pile variety.

v 4 represents one limb of a bell crank lever normally drawn, as by the adjustable spring- 5, in such direction as to tend to compress the carbon pile 3 and reduce the resistance thereof.

6 is the remaining limb of the bell crank lever provided with a core of magnetic material 7, the motion of which may control the operation of the generator by controlling the resistance in the pile 3.

8 is the positive lead of the generator in communication with the positive side of a storage battery 9 and lamps or other translating device's indicated at 10, the negative terminals of the lamps and battery being connected with the wire 11, carried to one side of the automatic switch 12, having its remaining terminal carried as by wire 13 to one side of the solenoid 14, theremaining side of which is connected as by the lead 15 with thenegative brush of the generator. 16 is a solenoid in shunt. across the generator circuit through a resistance 17 and normally tends to draw the core 7 downwardly a ainst the action of spring 5 and increase t e resistance 3.

18 represents one limb of a bell crank lever provided at its extremity with an adjustable screw 19, insulated therefrom as shown.

Specification of Letters Patent.

articular ob- Patented J une 20, 1916.

Application-flied March 4, 1912. Serial No. 681,347.

Said lever is normally drawn, as by the adjustable spring 20, against the adjustable stop 21. The other limb 22 of the said lever is provided at its extremity with a core 23 surrounded by the solenoid 14 in such manner that energization of the said solenoid tends to draw the lever downwardly and swing the contact screw 19 against an insulated portion 24 of the lever 4. The insulated portion 24; is connected through an adjustable resistance 25 to one side of the coil 16, and the adjustable screw 19 is in electrical communication with the opposite side of the coil 16 and through wire 26, which may have included in series therewith a differential coil 27 opposing the action of coil 16, if desired.

An operation of my invention is substantially as follows :-If the generator be run-' ning, current will flow through lead 8, re

sistance 3 and coil 2 and cause the field of the generator to build up ,in a well-known manner. If, now, the speed of the generator be increased until its voltage be slightly above that of the battery, the switch 12 will close and cause current to flow from the generator through lead 8, battery 9 or translating devices 10 to wire'll, thence through switch 12, wire 13, solenoid 14 and wire 15 to the generator. The switch 12 is preferably of the automatic variety adapted to open and close the generator circuit when the voltage of the generator is very close to that of the storage battery, and as many antomatic switches to perform this office are well known in the art, a simple form is merely indicated diagrammatically to indicate the presence of such a switch. With the system thus operating, current will flow through resistance 17 solenoid 16 to the lead 15 and tend to draw the core 7 downwardly and increase resistance 3, and I so adjust the spring 5 that when the maximum voltage desired to have impressed across the storage battery is reached, any tendency of the generator voltage to rise above this limit will draw the core 7 downwardly and increase the resistance 3 in such manner as to prevent the generator voltage from exceeding this desired limit, and thus the genertor will be automatically governed to hold a constant potential upon the supply circuit throughout wide changes in speed and load, and as the storage battery becomes charged and its voltage approaches that voltage held upon the supply circuit by the regulator, the charging current will gradually taper off. If, however, the battery be so run down or discharged that its'voltage is quite low, and this constant voltage regulation of the generator would cause too great a current to be supplied to the battery or to the battery and translation circuit, it is desirable that a maximum current to be, delivered by the generator shall not be exceeded and, I so adjust the spring 20, that when the desired maximum current in the solenoid 14 is reached, the same Will draw the core 23 downwardly and swing the screw 19 into contact with the insulated portion 24 of the lever 4;. Thus, by completing the circuit through 25, 24, 19, wire 26' and'differential coil 27, if the same be used, the action of coil 14 will weaken the eflect of the coil 16 in a well known manner so that, even with the standard voltage across the generator circuit the said coil 16 would not so manipulate the resistance 3 as to hold the standard voltage constant and, therefore, the regulation of the resistance 3 is now imposed upon the coil 14 and its cooperating connection with the said resistance, and the regulation of the generator becomes current regulation, as distinguished from voltage regulation, in consequence, the current output will be maintained constant throughout speed changes so long as the said output be of sufficient dimensions.

If, for any reason the output be so decreased that the spring 20 will cause the core 23 to be raised and the contacts at 1924:

broken, the system will again operatewith a standard voltage constant on the supply circuit throughout speed changes, and if this voltage again for any reason cause too great a current to be delivered, the current regulating mechanism will. assume control of the generator. 1

I do not wish in any way to limit myself to the exact details of construction nor to the exact mode of operation set forth in this specification to illustrate one type of system embodying the essentials of my invention, for it will be obvious that wide departure may be made in the Way of details without departing from the spirit and scope of my invention, which is as set forth in the followin claims.-

1. The combination with a generator, of a regulator therefor, comprising operating means responsive to voltage fluctuations, operatlng means responsive to current fluctuations, and means responsive to one, of said operating means for determining which of said operatlng means shall regulate the generator.

2. The combination with a generator, of a regulator therefor,

comprising operating shall operate said element.

4;. The combination with a generator and regulating means therefor, of means in shunt across the generator for affecting the regulating means in response to voltage fluctuations, means for affecting the regulating means in response to current fluctuations, and means comprising an element in shunt with the voltage responsive means to cause the aflecting means to cooperate in the regulation of the generator.

5. The combination with a generator, of a regulating element affecting the same, means for aflecting said regulating element in response to voltage fluctuations, means for affecting said regulating element in response' to current fluctuations, and means whereby the current responsive means weakens the voltage responsive means.

6. The'combination with a generator and a supply circuit, of a regulator for the generator comprehending operating means responsive to voltage fluctuations, operating means responsive to current'fluctuations in the supply circuit, and means brought into action by cooperation of said operating means for determining which of said operating means shall regulate the generator.

7. The combination with a generator and a supply circuit, of a regulator for the generator comprehending operating means responsive to voltage fluctuations, operating means responsive to current fluctuations in the supply circuit, and means made effective by the action of one of said operating means for determining which of said operating means shall predominate in the regulation of the generator,

8. The combination with a generator and a circuit supplied thereby, of a regulating element adapted to control the output of the generator, means for affecting said element in response to voltage fluctuations, means for affecting said element in response to our rent fluctuations in said circuit, and means for controlling the operation of the responsive means to determine which of the latter shall regulate the generator.

9. The combination with a generator and a circuit. supplied thereby, of a regulating responsive means to determine which 'of' the latter shall predominate in the regulation of the generator.

10. The combination with a generator and a regulating element therefor, of a voltage responsive coil affecting said element, a current responsive coil affecting said element, and means brought into action by the operationof one of said coils to affect the current in the other coil.

11. The combination with a generator and a regulating element therefor, of a voltage responsive coil affecting said element, a current responsive coil affecting said element, and means brought into action by the operation of one of said coils to affect the current in the other coil by diverting current therefrom.

12. The combination with a generator; and a translation circuit; of a regulator for the generator having the function of maintaining substantially constant voltage on the translation circuit throughout speed changes, said regulator comprising a regulating element; electromagnetic means for varying the action of the regulating element; auxiliary electromagnetic means for modifying the action of the electromagnetic means; and a normally open circuit including a differential coil; and means whereby when the auxiliary and main electromagnetic means cooperate the open circuit will be closed and the differential coil will come into action to modify the action of the elec tromagnetic means.

13. The combination with a generator and a translation circuit; of a regulator for the generator comprising a regulating element; electromagnetic means in shunt to the generator for varying the action of the regulating element; current controlled means arranged in cooperative relation to the electromagnetic means to modify the action of the latter; and a normally open circuit including a differential coil and an adjustable resistance arranged to be closed when the electromagnetic means and the currentcontrolled means cooperate, whereby the differential coil is caused to oppose the action of the electromagnetic means.

14. The combination with a generator; and a translation circuit; of a regulator for the generator comprising a field coil and a regulating element therefor; electromagnetic means in shunt to the generator for varying the action of the regulating element; current-controlled means in series in the translation circuit cooperating with the electromagnetic means for weakening the effect of the latter, so as to prevent the latter from holding standard voltage constant on the translation circuit; a normally open.

circuit including a differential coil; and means whereby when the current-controlled means and electromagnetic means cooperate, the said open circuit will be closed and the differential coil will be caused to oppose the action of the electromagnetic means.

JOHN L. CREVELING. 'lVitnesses ANNA M. WALL, Rosa A. GAFFNEY. 

